The heat wave that gripped southwestern Connecticut yesterday, sizzles again today with temperatures again in the upper-90s and stifling air quality.

The National Weather Service has issued another "heat advisory" until 7 p.m. today, warning that in combination with the day's humidity, temperatures could feel as though they are cresting at 100 degrees -- and higher.

The scorching air mass over the region also means that ozone levels could exceed healthy levels, officials warn.

Tonight should be partly cloudy with the temperature dipping to a low around 73 degrees.

Tomorrow brings a chance of showers and thunderstorms, mainly after 8 a.m., with some of the storms possibly triggering gusty winds and heavy rain. Otherwise, the day is expected to be mostly cloudy, with a high temperature around 90 degrees, the NWS says.

Tomorrow night, showers and thunderstorms are likely, with scattered downpours and high winds also possible. The overnight low temperature will be in the upper-60s, the NWS says.

On Saturday, there is a slight chance of showers and thunderstorms before noon. Skies otherwise should be sunny, with a high temperature in the mid-80s. Saturday night should be partly cloudy, with a low temperature in the mid-60s.

The outlook for Sunday, the weather service predicts, is mostly sunny and temperatures in the mid-80s.